Can



W. E. BURNS CAN Filed March 7, 1927 2 Sheets-Sheet l l l l l l I I llllllllllllllll INVENTOR. M/gr/ urn' /f/i ATTORNEY.

Feb. 18, 1930.

Patented Feb. 18, 41930 UNITED 'STATI-:s

PATENT OFFICE WILFORD E. BRNS, OF BURLINGAME, CALIFORNIA, ASSIGNOR TO M. J'. B. CO., OF SAN'L FRANCISCO, CALIFORNIA, A CORPORATION OF DELAWARE CAN Application led March 7,

This invention relates to the so-called tin cans as used for preserving food and has to do with special construction in a can of the tearing strip removable `end type of can as shown in my U.' S. Patent No. 1,615,930 issued displaced vertical lock seam as seen from the outwardly and downwardly upon itself and line 2--2 of Fig.v1. Fig. 3 is a cross section of the upper portion ofthe can enlarged about five times to illustrate better the form and relation of its parts: Fig. 4 shows in broken plan the full size ofthe special notching and slitting of the can body blank. Fig.

'5 shows the blank folded to form a triple layer across th'e upper end preparatory to forming the tubular body. Fig. 6 is a vertical section of Fig. 5 taken along the line 6-6 thereof, and Fi 7 shows the ends of the folded blank of Fig. 5 brought together and joined by a compound lock, butt, and lap sea-1n.

In Afurther detail the can comprises a tubular body 1 of sheet metal with lower and upper heads 2 and 3 respectively double seamed or crimped thereto, as indicated.

"The body of this can is of constant internal diameter across the various points as at A, B,

C, or rather has a smooth unbroken wall from top to bottom for it is obvious that it may be tapered, or may even be a rectangulancan in so far as the present invention is concerned.

At the upper end the body metal is folded then upward, (all done before vforming the blank into a tube) so as to provide a triple layer or band of metal at the upper end and the outer layer 4 of which is circumferentially scored at the points D-E to provide ya. tearing strip and which -terminates in a free tongue 5 in the known manner so that 1527. serial no. 173,460.

it may be engaged by a key and torn oif,.and thereby leaving the top end or lid of the can free.

-band of metal lies entirely to the outside of the straight inside vertical surface of the can wall, thus there is no inward bending of the metal to form the triple band, andthe inal outer layer 4 rises with a slight inward bend above the band Ainto the crimp or double seamed joint/G formed with the lid member 3.

Some cans of this type in the prior art had an internal ridge or shoulder caused through the inward bending or curving of the bodyY -metal to form the 4triple layer, and as this reduces the internal diameter of the can near the top itis objectional in preventing thel ready discharge of some commodities from such cans the importance of a straight interior wall will be evident.

r From the lower edge of the triple layer band the body is formed with a lock seam 7 of which the fold lies within the can as is common practice, but in the present can, the multiple band lying outside of the can body forms an external step at X which would prevent machine soldering of the vertical seam (done .before Hanging the body and seaming on of the heads) and which is one of the reasons why such cans have not come into common use. However, I have found that the body maybe so formed as to bring the outside of the vertical seam flush with the outer layer 4 of the band just at the lower edge of the band and then gradually fall back into line with the can wall as designated by the dotted vline F.

This is preferably done by the aid of a suitn ably shaped forming horn when making the tubular bodies and closing the vertical lock seam, and it eects a pushing out of the seam since the vertical lock seam 7 is of four thicknesses of metal each thinner than 'a single line of a drawing, but it is sufficiently shown in Fig. 2 a cross section through the outwardly displaced lock seam 7 taken just below the band and showing the outside of the vseam displaced outwardly to the point F corresponding to the upper end of line F of Fig. 1 or outside surface of the band.

In Fig. Sthe enlarged cross section of the folded body wall of thecan and lid doubleseamed thereto, shows in dotted lines 3 another lid to illustrate how the lids would nest one upon the other with absolutely no tendency to wedge together. This is due to making the annular depression H of such a shape that while of van outer diameter just large enough to receive another lid, its inner diameter defined by the vertical wall will not permit the annular depressed portion of a lid above to enter. This is very important in facilitating the manufacture of this particular type of can wherein the lids before crimping or seaming to the can bodies are stacked in the manner lindicated and must .be proof against sticking together, yet should be self aligning.

It might here be mentioned that the slight inward bend of the outermost layer 4 of the can wall observed just above the band is the natural result offorming the body blank to tubular shape as the singlewall above the triple layer band being unsupported therefore falls inwardl a trifle at .this point.

In making the ody of my can I cut out a blank specially notched and slit as shown in Fig. 4, score it on the far side along the lines D, E, and-then fold it twice upon itself to the position of parts indicated in Figs. 5 and 6. The margins 15, 16 are reversely hooked as indicated in Fig. 5, and the blank is formed to tubular shape with the margins engaged to produce the vertical lock seam 7 which extends from the lower edge X only of the multiple layer band downward.

By observing the blank of Fig. 4 it will be seen that the left hand edge is straight with the exception of the angularly notched out portion 17-18, and thatafter bending the Y margin 15 forwardly to-form the hook as shown in Fig. 5 that the portionsv J, K, project beyond the folded edge 15 which in this respect differs from my former patent men- 'the opposite end of the blank. A

The outermost layer 22 of the blank is slightly notched above and below the tearing strip tongue 5 as indicated at 28 so that the strip will start to tear properly, and if desired the scoring of the strip may include the known angularly diverging or herringbone score lines d, e, as indicated on Fig. 1.

When' the vertical joint is complete the angularly notched portions 17--18-19-20 form abutting edges sandwiched between the outermost layer 22 and innermost layer J which lie in simple overlapping relation to the surroundin metal, all as thought clearly shown in Fig.

In Fig. 5 the angular edges 18-20 are seen to extend slightly beyond edges 17--19, but

in forming the tubular body these all align due to larger diameter of the outer layer.

Before soldering the vertical seam it is displaced angularly outward to line F as previously described, and after soldering the vertical seam the ends of the body are flanged outwardly and double seamed to the heads in the usual manner.

In considering my can as shown in the drawing it will be observed that after tear-` ing oif the strip along the lines D-E the freed internal friction Flid is already just seated within the can and is capable, under pressure of a slight further downward movement. to insure an air tight friction fit, so

that the lid may always be replaced in an air l tight manner over the contents until all are i most layer extending upward abovesaid` triple layer into engagement with said ltop head and outwardly flanged and double seamed to said top head.

2. A sheet metal can comprising a tubular body with a bottom and a top head secured thereto, said body being folded at' its upper end to produce a band of a plurality of layers of metal around the can while preserving a' straight internal wall to the can, score lines on the outermost layer of metal defining a tearing strip therearound, said body being joined by a lock seam from the band downward, and said'lock seam being'displaced outward from the can to substantially flush relaj ward from the can to substantially flush relation with the outer surface of said band at its juncture with the same, and falling gradually back into the line of thecan body toward the lower end of the can.

4. A Vsheet metal can comprising a tubular body with a bottom and a top head secured thereto, said body being folded at its upper end to produce a band of a plurality of layers of metal around the can while preserving `a straight internal wall to the can, score lines on the outermost layer of metal defining a tearing strip therearound, said body being joined by a lock seam from the band down' ward, and said lock seam and adjacent metal being displaced outward from the can to substantially flush relation with the outer surface of said band at its uncture with the same and falling gradually back into the line of .the can body toward the lower end of the can. 5. A sheet metal can comprising a tubular body with heads secured thereto, the wall of said body being bent outwardly and Jfolded upon itself adjacent one end to produce a multiple layer band of metal around the can, said body being longitudinally seamed and the seam displaced outwardly to substantially 'flush relation on the outside with v the outside of said band.

6. A sheet metal can comprising a tubular body with headssecured thereto, said body provided with an outwardly projecting circumferential step `at itsupper end, and said body being joined by a vertical seam having an outer surface substantially Hush with the outside of said step. j

7,. A sheet metal can comprising a tubularbody with heads secured thereto, the wall of said body adjacent the upper end of the can being folded in reverse directions upon itself to produce a multiple layer band of metal around the can, said body being longitudinally joined by a lock seam from the lower edge of said band downwardly, the body seam at the band comprising intermediate layers of metal with edges 1n abutting relation sandwiched between layers extendingrespectively in opposite directions pastfthe abutting edges and one of said lastmentioned layers for the width of said band extending substantially past the lock seam of the body.

- 8. A sheet metal can comprising a tubular body with heads secured thereto, the wall of said body adjacent the upper end of the can I being folded in reverse directions upon itself to produce a multiple layer band of metal around` the can, saidbody being longitudinally -joined by a lock seam from the lower edge of said band downwardly, the body seam at the band comprising inter-mediate layers 'v of metal with edges in abutting relation sandwiched between inner and outer'layers of the band extending respectively in opposite directions past the abutting edges and the inner one of said last mentioned layers for the width 0f said band extending substantially past the lock seam of the body.

WILFORD E. BURNS. 

